Internal combustion engine



FIG. 1 is a front view of a internal combustion engine showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is an upper front right perspective view thereof;

FIG. 8 is an upper rear right perspective view thereof;

FIG. 9 is an upper rear left perspective view thereof; and,

FIG. 10 is an upper front left perspective view thereof. 

CLAIM The ornamental design for a internal combustion engine, as shown and described. 